Year	Number of Years
1960-01-01	69.9236585365854
1961-01-01	70.2508536585366
1962-01-01	70.4722926829268
1963-01-01	70.5949268292683
1964-01-01	70.6327804878049
1965-01-01	70.6033658536585
1966-01-01	70.5252439024390
1967-01-01	70.4185365853659
1968-01-01	70.3068292682927
1969-01-01	70.2057073170732
1970-01-01	70.1342439024390
1971-01-01	70.0994878048781
1972-01-01	70.0989268292683
1973-01-01	70.1250731707317
1974-01-01	70.1759024390244
1975-01-01	70.2448780487805
1976-01-01	70.3224634146341
1977-01-01	70.3986097560976
1978-01-01	70.4652439024390
1979-01-01	70.5199024390244
1980-01-01	70.4085365853659
1981-01-01	70.6292682926829
1982-01-01	70.6890243902439
1983-01-01	70.4790243902439
1984-01-01	70.7509756097561
1985-01-01	70.7346341463415
1986-01-01	71.0212195121951
1987-01-01	71.0887804878049
1988-01-01	71.2078048780488
1989-01-01	71.0263414634146
1990-01-01	70.9326829268293
1991-01-01	70.8829268292683
1992-01-01	71.7951219512195
1993-01-01	72.4487804878049
1994-01-01	72.3000000000000
1995-01-01	72.2536585365854
1996-01-01	72.6536585365854
1997-01-01	72.7048780487805
1998-01-01	72.5512195121951
1999-01-01	72.9024390243902
2000-01-01	73.0512195121951
2001-01-01	73.4024390243903
2002-01-01	73.6048780487805
2003-01-01	73.6048780487805
2004-01-01	73.9585365853659
2005-01-01	73.9048780487805
2006-01-01	74.2048780487805
2007-01-01	74.2073170731707
2008-01-01	74.7048780487805
2009-01-01	74.9097560975610
2010-01-01	75.1121951219512
2011-01-01	75.9585365853659
2012-01-01	76.1097560975610
2013-01-01	76.4121951219512
2014-01-01	76.8121951219512
2015-01-01	76.5634146341463
2016-01-01	76.5634146341463